Need to delineate between 1st and 3rd party cookies

Issue in ./help/interface/cookies-target.md

Some of the content on this page is confusing. For example, cookies don't have a "server domain" setting, they just have a domain setting. If it's a 3rd party cookie set by Target, then it will have a domain setting which includes "tt.omtrdc.net". If it's a first party cookie, it will be set on the customers domain.

I think country codes like .co.uk have had out-of-the-box support for many years.

The page still refers to "campaigns" instead of "activities". It should probably be revamped.

Start by reading help/interface/cookies-target.md and compare its cookie terminology with the issue’s examples for first- and third-party cookies. Update the page so the domain wording, country-code support, and activities terminology are accurate and clear; done means the confusing references and outdated “campaigns” wording are resolved.

Written by the indexing model from the issue text.